What is Sebum?

Sebum is a fatty substance secreted from the sebaceous glands. Most of these glands open into hair follicles. Constituent% by Weight Glycerides* and free fatty acidsuent 57.5 Wax esters 26.0 Squalene** 12.0 Cholesteryl estersÝ 3.0 Cholesterol* 1.5 *Includes triglycerides — the most common form of fat.